<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon :closable="false"></el-alert>
      <!-- 选择商品分支 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加动态参数按钮 -->
          <el-button
            type="primary"
            @click="addDialogVisible=true"
            :disabled="isBtnDisabled"
            size="mini"
          >添加动态参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="minTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag @close='handeClose(i,scope.row)' closable v-for="(item,i) in scope.row.attr_vals" :key="i">{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  @click="showEditDialog(scope.row.attr_id)"
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                >编辑</el-button>
                <el-button
                  @click="deleEditDialog(scope.row.attr_id)"
                  type="danger"
                  size="mini"
                  icon="el-icon-deleted"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加静态属性按钮 -->
          <el-button
            type="primary"
            @click="addDialogVisible=true"
            :disabled="isBtnDisabled"
            size="mini"
          >添加静态属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="minTableData" border stripe>
            <!-- 展开行 -->
           <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag @close='handeClose(i,scope.row)' closable v-for="(item,i) in scope.row.attr_vals" :key="i">{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  @click="showEditDialog(scope.row.attr_id)"
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                >编辑</el-button>
                <el-button
                  @click="deleEditDialog(scope.row.attr_id)"
                  type="danger"
                  size="mini"
                  icon="el-icon-deleted"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加'+ titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClose"
    >
      <!-- 添加参数对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改对话框 -->
    <el-dialog
      :title="'修改'+ titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClose"
    >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      //商品分类列表
      cateList: [],
      //级联选择框配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择框双向绑定的数组
      selectedCateKeys: [1, 3, 6],
      //被激活的页签名称
      activeName: "many",
      //动态列表数据源
      minTableData: [],
      //静态列表数据源
      onlyTableData: [],
      //控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {},
      //添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //
      editForm: {},
      //修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      //控制按钮与文本框的显示切换
      // inputVisible:false,
      //文本框中输入内容
      // inputValue:''
    };
  },
  created() {
    //获取所有的商品分类
    this.getCateList();
    this.getParamsDta();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类失败");

      this.cateList = res.data;
    },
    //级联选择框选中项变化，会触发这个项目
    handleChange() {
      this.getParamsDta();
    },
    //tab页签点击事件的处理函数
    handleClick() {
      // console.log(this.activeName);
      this.getParamsDta();
    },
    async getParamsDta() {
      // console.log(this.selectedCateKeys);
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [],
        this.minTableData = []
      }
      //根据所选分类的id，与当前所属id的面板获取对应的参数

      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) return this.$message.error("获取参数失败");

      res.data.forEach(function (item) {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        //控制文本框的显示与隐藏
        item.inputVisible=false
        //文本框中输入的值
        item.inputValue = ""
      });
      this.minTableData = res.data;
    },
    //监听
    addDialogClose() {
      this.$refs.addFormRef.resetFields();
    },
    //
    editDialogClose() {
      this.$refs.editFormRef.resetFields();
    },
    //点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (vaild) => {
        if (!vaild) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) return this.$message.error("添加参数失败");
        this.$message.success("添加参数成功");
        this.getParamsDta();
        this.addDialogVisible = false;
      });
    },
    //点击按钮展示修改对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const {
        data: res,
      } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      );

      if (res.meta.status !== 200)
        return this.$message.error("获取参数信息失败");
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    //点击按钮修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (vaild) => {
        if (!vaild) return;
        const {
          data: res,
        } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        );
        if (res.meta.status !== 200) return this.$message.error("修改参数失败");
        this.$message.success("修改参数成功");
        this.getParamsDta();
        this.editDialogVisible = false;
      });
    },
    //删除
    async deleEditDialog(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除!");
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) return this.$message.error("删除失败");
      this.getParamsDta();
      this.$message.success("删除成功");
    },
    //文本失去焦点或enter触发事件
    async handleInputConfirm(row){
      if(row.inputValue.trim().length===0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      //需要发起请求，保存这次操作
      this.saveAttrVals(row)
      
      row.inputValue = ''
      //如果没有return则需要对输入内容进行处理
      row.inputVisible=false
      // console.log(row.inputVisible);
    },
    //将对attr_vals的操作保存到数据库
    async saveAttrVals(row){
      //需要发起请求，保存这次操作
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
       {attr_name:row.attr_name,attr_sel:row.attr_sel,attr_vals:row.attr_vals.join(' ')}
      )
      if(res.meta.status!==200) return this.$message.error('修改参数项失败')
      this.$message.success('修改参数项成功')
    },
    //点击按钮展示文本输入框
    showInput(row) {
        row.inputVisible = true;
        //让文本框自动获得焦点
        //$nextTick 方法作用，就是当页面上元素被重新渲染之后，
        //才会返回指定函数

        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
      },
    //删除对应的参数可选项
    handeClose(i,row){
       row.attr_vals.splice(i,1)
       this.saveAttrVals(row)
    }
  },
  computed: {
    //如果按钮需要被禁用，则返回true，否则false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      } else {
        return false;
      }
    },
    //当前选中三级分类id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        // console.log(this.selectedCateKeys);
        return this.selectedCateKeys[2];
      } else {
        return null;
      }
    },
    //对话框title动态计算标题文本
    titleText() {
      if (this.activeName == "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    },
  },
};
</script>


<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 5px;
}
.input-new-tag{
  width: 120px;
}
</style>
